/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.alipay.sofa.registry.util;

import java.util.concurrent.ThreadFactory;
import java.util.concurrent.atomic.AtomicInteger;

/**
 * @author shangyu.wh
 * @version $Id: NamedThreadFactory.java, v 0.1 2018-10-11 11:25 shangyu.wh Exp $
 */
public class NamedThreadFactory implements ThreadFactory {

  private static final AtomicInteger POOL_NUMBER = new AtomicInteger(1);
  private final AtomicInteger threadNumber = new AtomicInteger(1);
  private final ThreadGroup group;
  private final String namePrefix;
  private final boolean isDaemon;

  public NamedThreadFactory(String name) {
    this(name, false);
  }

  public NamedThreadFactory(String prefix, boolean daemon) {
    SecurityManager s = System.getSecurityManager();
    group = (s != null) ? s.getThreadGroup() : Thread.currentThread().getThreadGroup();
    namePrefix = prefix + "-" + POOL_NUMBER.getAndIncrement();
    isDaemon = daemon;
  }

  /**
   * Create a thread.
   *
   * @see ThreadFactory#newThread(Runnable)
   */
  @Override
  public Thread newThread(Runnable r) {
    Thread t = new Thread(group, r, namePrefix + threadNumber.getAndIncrement(), 0);
    t.setDaemon(isDaemon);
    if (t.getPriority() != Thread.NORM_PRIORITY) {
      t.setPriority(Thread.NORM_PRIORITY);
    }
    return t;
  }

  public String getNamePrefix() {
    return namePrefix;
  }
}
